Le papillon de Hofstadter
Séminaire Bourbaki : volume 1991/92, exposés 745-759, Astérisque no. 206  (1992), Talk no. 745, p. 7-39
@incollection{SB_1991-1992__34__7_0,
     author = {Bellissard, Jean},
     title = {Le papillon de Hofstadter},
     booktitle = {S\'eminaire Bourbaki : volume 1991/92, expos\'es 745-759},
     author = {Collectif},
     series = {Ast\'erisque},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {206},
     year = {1992},
     note = {talk:745},
     pages = {7-39},
     zbl = {0791.46057},
     mrnumber = {1206063},
     language = {fr},
     url = {http://www.numdam.org/item/SB_1991-1992__34__7_0}
}
Bellissard, Jean. Le papillon de Hofstadter, in Séminaire Bourbaki : volume 1991/92, exposés 745-759, Astérisque, no. 206 (1992), Talk no. 745, pp. 7-39. http://www.numdam.org/item/SB_1991-1992__34__7_0/

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